copper blackening

[Gerard-E]

Hi,

I am trying to blacken a copper strip (will probably come in reels, which also makes this more difficult). I know this can be done by a number of different methods, but I need something that can keep surface electrical conductivity after blackening. This seems much more difficult to achieve.

Has anyone heard of Ebenol C or Ebonol C? these products can apparently do this, but I cannot find anyone to do a coating test for us!! I have managed to get some spec sheets from different chemical companies, but they don't seem to be able to connect me with anyone that uses such products!!

Any and all help will be appreciated.
Thanks

G

 

You cannot have a coating or corrosion layer that will permit you to retain the full surface electrical conductivity of bare copper.
Copper will not anodize like aluminium will (at least as far as I know; perhaps Instagram hipsters have made a breakthrough there).
Haven't heard of Ebenol. Otherwise I don't know what to recommend, but I suspect a possible method might involve sulphur somehow.


"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

 

[3DDave]

https://aip.scitation.org/doi/abs/10.1063/1.1741178?journalCode=rsi

describes Ebenol C - cupric oxide. Seems solely for corrosion resistance and seems unlikely to be electrically conductive.

 

[dik]

Liver of sulphur... I don't know how it affects the conductivity.

https://www.google.com/search?q=liv...rome..69i57.8520j0j1&sourceid=chrome&ie=UTF-8

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[TugboatEng]

Liver of sulfur contains potassium sulfides so it's likely just corrosion the copper.

 

[dik]

Yup... but the only thing I know of that turns it black.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[TugboatEng]

There is electrically conductive paint and it's available in black.

https://www.bareconductive.com/blog...position-and-application-of-conductive-paints

 

[WKTaylor]

MIL-F-495 FINISH, CHEMICAL, BLACK, FOR COPPER ALLOYS

I think You can also apply Phosphate treatments to copper alloys [paint base or standalone coating].


Regards, Wil Taylor
o Trust - But Verify!
o We believe to be true what we prefer to be true. [Unknown]
o For those who believe, no proof is required; for those who cannot believe, no proof is possible. [variation,Stuart Chase]
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion", Homebuiltairplanes.com forum]

 

MIL-F-495

Phrasing.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

 

[WKTaylor]

Ironic M… MIL-F-495... Phrasing???

Regards, Wil Taylor
o Trust - But Verify!
o We believe to be true what we prefer to be true. [Unknown]
o For those who believe, no proof is required; for those who cannot believe, no proof is possible. [variation,Stuart Chase]
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion", Homebuiltairplanes.com forum]